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Pilot/Controller Glossary

3/29/18

PCG D

−4

divergent. The sizes of downbursts vary from 1/2
mile or less to more than 10 miles. An intense
downburst often causes widespread damage. Damag-
ing winds, lasting 5 to 30 minutes, could reach speeds
as high as 120 knots.

DOWNWIND LEG

(See TRAFFIC PATTERN.)

DP

(See INSTRUMENT DEPARTURE PROCEDURE.)

DRAG CHUTE

− A parachute device installed on

certain aircraft which is deployed on landing roll to
assist in deceleration of the aircraft.

DROP ZONE

− Any pre-determined area upon which

parachutists or objects land after making an
intentional parachute jump or drop.

(Refer to 14 CFR §105.3, Definitions)

DSP

(See DEPARTURE SEQUENCING PROGRAM.)

DT

(See DELAY TIME.)

DTAS

(See DIGITAL TERMINAL AUTOMATION

SYSTEM.)

DUE REGARD

− A phase of flight wherein an

aircraft commander of a State-operated aircraft

assumes responsibility to separate his/her aircraft
from all other aircraft.

(See also FAA Order JO 7110.65, Para 1

−2−1,

WORD MEANINGS.)

DUTY RUNWAY

(See RUNWAY IN USE/ACTIVE RUNWAY/DUTY

RUNWAY.)

DVA

(See DIVERSE VECTOR AREA.)

DVFR

(See DEFENSE VISUAL FLIGHT RULES.)

DVFR FLIGHT PLAN

− A flight plan filed for a VFR

aircraft which intends to operate in airspace within
which the ready identification, location, and control
of aircraft are required in the interest of national
security.

DVRSN

(See DIVERSION.)

DYNAMIC

− Continuous review, evaluation, and

change to meet demands.

DYNAMIC RESTRICTIONS

− Those restrictions

imposed by the local facility on an “as needed” basis
to manage unpredictable fluctuations in traffic
demands.